Rock-drill



Y ROCK DRILL.

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IQE. STOREY.

UNITED STATES PATENT OFFICE.v

IMLE E. STOREY, OEBOULDER, COLORADO, ASSIGNOR TO THE STOREY ELECTRIC DRILL AND POWER COMPANY, OF COLORADO.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent N' o. 545,109, dated August 27, 1895.

Application niet February 24. 1892@ senat No. marasma model.)

To @ZZ whom t may concern/.-

Be it known that I, IMLE E. STOREY, a citizen of the United States, residing in Boulder, in the county of Boulder and State of Colorado, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification. My invention relates to rock-drills, the object being to provide a small portable drill adapted to bore short holes, and therefore specially useful in the work known as plug and feathering.

My improved drill is operated by an electric motor, and the invention consists in the details of construction, which will hereinafter be pointed out and claimed.

In the accompanying drawings, Eigure l represents a side elevation of the drill; Fig. 2, alongitudinal section of the same, and Fig. 3

a section taken on line x x of Fig.V 2.

Referring to the drawings by letter, A represents'an iron cylinder constituting a portion of the eld-magnet of `an electric motor, the pole-pieces of which are formed as described in my patent, No. 488,041, dated December 13, 1892.

B represents the armature of this electric motor, which is supported by a spider keyed to the sleeve o, constituting the armatureshaft. This sleeve has its bearings in closed cylindrical heads C C at each end.

c represents the commutator, and c' the brush-holder.

The forward head C has a tubular extension d, concentric with the axis of the motor. The forward end of this extension is open and its edges armed with teeth d. Near the for ward end openings d2 are provided, for purposes which will hereinafter appear. The rear head C has two segmental rearward extensions e e, parallel to each other and forming parts of a cylinder the axis of which coincides with the axial line of the motor. The other ends of these extensions are connected by a disk-head e', having a central socket on its inner side containing a cushion e2 of rubber or othersuitable material. The adjacent or inner faces of the extensions e c are provided with central longitudinal tracks or guides e3, extending their full length.

I represents the drill-rod. It is tubular and located inside of the hollow armature-shaft h and connected thereto by means of a spline or feather running loosely in the groove in the rod, whereby the rod must rotate with the shaft, but is free to slide longitudinally within it. The rear end of the drill-rod carries a small pump c', which takes water in through the flexible tube t" and forces it through the tubular drill-rod to its forward end or bit 'i2 for the purpose oflubricating the bit and preventing the hole from becoming clogged. The pump-shell t3 contains a stuiiing-box t4. It remains stationary while the drill-rod turns, the connection between them being through ball-bearings The pump-shell is provided with grooves lat opposite points, which embrace the tracks e3, and thus form* a support for the rear end of the drill-rod. The pump-shell and ball-bearings are surrounded by a cylinder f, the forward end of which has a angef formed upon it, which embraces a shoulder formed on the drill-rod. The rear end of the cylinder has formed upon it a radial circular plate f2, which ltits the inner faces of the extensions e and is provided with two grooves at opposite points which embrace the tracks e3. This plate also has two yokes f3, which extend out through the openingsbetween the extensions e and carry handles f4, which may be grasped in the hands of the operator. `The cap t6, inclosing the pump, has a central lug t7, which strikes the cushion c2 when the drill-rod is brought back its full distance. The length of the drill-rod is such that when the pump is back `against the cushion the bit or point 112 is justinside of the tube d and is protected thereby.

lThe operation'of plug and-feathering consists in drilling a series of shallow holes along aline to predetermine where the rock will break when the wedges are driven. This drill Yhas been specially designed to perform this pushing upon the handles toward the rock he forces the drill-point against and into the roo rock. IIe feeds the point in with any Variation of pressure which the hardness of the roekdemands until the hole has been bored deep enough or the forward end of the pump is stopped by abutting against the rear bearings of the motor-shaft. The handles are then pulled backward until the pump strikes the cushion e2, when the drill is bodily lifted and the end of the tube d is located at the point Where the next hole is to be drilled, and the same operation is again performed. The drill may be run continuously or be stopped after each hole is bored; but it Will be ob served that When the point of the drill is out ofthe rock it cannot come in contact with any other object and nothing can comein contact with it because of the protection which the tribe affords. The Water is started at about the same time that the motor is and keeps the drill-point cool, and at the same time washes the loose material which is cnt by the point out through the hole and through the openings d2 in the tube. A full-sized drill will Weigh about one hundred pounds, and. maybe operated by one man. The electrical current will be conducted through the motor by flexible Wires, which Will permit of a Wide range of movement. The flexible hose con- Veying the Water to the pump will also be made so as to permit of the Varying and wide movement of the drill.

Having thus described my invention, I claim- In a drill, the combination of a motor, a drill rod driven thereby but capable of independent longitudinal motion, a forwardly extended housing frame through which the drill rod passes and upon which the drill rests when in operation, a handle or handles attached to the drill rod by which it may be manually fed forward or Withdrawn, and a back stop for the drill rod, substantially as described.

In witness whereof AI have hereunto signed my name in the presence of two subscribing witnesses.

IMLI) E. S'l'ltlilY.

Witnesses:

JAMES F. KAVANAGH, FRANK S. Oene. 

